html {
  font-size: 62.5%;
}

.lcApp {
  background-image: url(../images/仑传app.jpg);
  background-repeat: no-repeat; /* 背景图片不重复 */
  background-position: center center; /* 背景图片居中显示 */
  background-size: cover; /* 背景图片覆盖整个元素区域 */
  width: 25rem;
  height: 25rem;
  margin: 0 auto;
  transform: translateY(70%);
}
